<?php

/**
 * zip
 * @category   压缩解压工具
 * @package    扩展库
 *
 */
namespace Manage\Library;
class Zip{
    protected $datasec = array();
    protected $ctrl_dir = array();
    protected $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
    protected $old_offset = 0;
    protected $total_files = 0;
    protected  $total_folders = 0;
    public function compress($dir,$zip_filename){
        if (function_exists('gzcompress')) {
            $filelist = $this->getFileList($dir);
            if (count($filelist)>0) {
                foreach($filelist as $filename) {
                    if (is_file($filename)){
                        $fd = fopen ($filename, 'r');
                        $content = fread($fd, filesize ($filename));
                        fclose ($fd);
                        $this->addFile($content, $filename);
                    }
                }
                $out = $this->file();
                $fp = fopen($zip_filename, 'w');
                fwrite($fp, $out, strlen($out));
                fclose($fp);
                return true;
            }
        }
        return false;
    }
    public function decompress($zip_filename, $dir='./'){
        $index = array(-1);
        $stat=array();
//        $ok = 0;
        $zip_fp = @fopen($zip_filename,'rb');
        if(!$zip_fp) return false;
        $cdir = $this->readCentralDir($zip_fp,$zip_filename);
        $pos_entry = $cdir['offset'];
        if(!is_array($index)){
            $index = array($index);
        }
        for($i=0; $index[$i];$i++){
            if(intval($index[$i])!=$index[$i]||$index[$i]>$cdir['entries'])return false;
        }
        for ($i=0; $i<$cdir['entries']; $i++){
            @fseek($zip_fp, $pos_entry);
            $header = $this->readCentralFileHeaders($zip_fp);
            $header['index'] = $i;
            $pos_entry = ftell($zip_fp);
            @rewind($zip_fp);
            fseek($zip_fp, $header['offset']);
            if(in_array('-1',$index)||in_array($i,$index))
                $stat[$header['filename']]=$this->extractFile($header, $dir, $zip_fp);
        }
        fclose($zip_fp);
        return $stat;
    }
    private function getFileList($dir){
        $file=array();
        if (file_exists($dir)){
            if( substr( $dir, -1 ) != "/" )$dir .= "/";
            $dh = opendir($dir);
            while($files = readdir($dh)) {
                if (($files!=".")&&($files!="..")){
                    if (is_dir($dir.$files)){
                        $file = array_merge($file, $this -> getFileList( $dir.$files ));
                    }else{
                        $file[]= $dir.$files;
                    }
                }
            }
            closedir($dh);
        }
        $file[] = '';
        return $file;
    }
    private function unixToDostime($unixtime = 0) {
        $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
        if ($timearray['year'] < 1980) {
            $timearray['year'] = 1980;
            $timearray['mon'] = 1;
            $timearray['mday'] = 1;
            $timearray['hours'] = 0;
            $timearray['minutes'] = 0;
            $timearray['seconds'] = 0;
        }
        return (
                    ($timearray['year'] - 1980) << 25)
                    | ($timearray['mon'] << 21)
                    | ($timearray['mday'] << 16)
                    |($timearray['hours'] << 11)
                    | ($timearray['minutes'] << 5)
                    | ($timearray['seconds'] >> 1
                );
    }
    private function addFile($data, $name, $time = 0) {
        $name = str_replace('\\', '/', $name);
        $dtime = dechex($this->unixToDostime($time));
        $hexdtime = '\x' . $dtime[6] . $dtime[7]
                    . '\x' . $dtime[4] . $dtime[5]
                    . '\x' . $dtime[2] . $dtime[3]
                    . '\x' . $dtime[0] . $dtime[1];
        eval('$hexdtime = "' . $hexdtime . '";');
        $fr = "\x50\x4b\x03\x04";
        $fr .= "\x14\x00"; // ver needed to extract
        $fr .= "\x00\x00"; // gen purpose bit flag
        $fr .= "\x08\x00"; // compression method
        $fr .= $hexdtime; // last mod time and date
        // "local file header" segment
        $unc_len = strlen($data);
        $crc = crc32($data);
        $zdata = gzcompress($data);
        $c_len = strlen($zdata);
        $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
        $fr .= pack('V', $crc); // crc32
        $fr .= pack('V', $c_len); // compressed filesize
        $fr .= pack('V', $unc_len); // uncompressed filesize
        $fr .= pack('v', strlen($name)); // length of filename
        $fr .= pack('v', 0); // extra field length
        $fr .= $name;
        // "file data" segment
        $fr .= $zdata;
        // "data descriptor" segment (optional but necessary if archive is not
        // served as file)
        $fr .= pack('V', $crc); // crc32
        $fr .= pack('V', $c_len); // compressed filesize
        $fr .= pack('V', $unc_len); // uncompressed filesize
        // add this entry to array
        $this -> datasec[] = $fr;
        $new_offset = strlen(implode('', $this->datasec));
        // now add to central directory record
        $cdrec = "\x50\x4b\x01\x02";
        $cdrec .= "\x00\x00"; // version made by
        $cdrec .= "\x14\x00"; // version needed to extract
        $cdrec .= "\x00\x00"; // gen purpose bit flag
        $cdrec .= "\x08\x00"; // compression method
        $cdrec .= $hexdtime; // last mod time & date
        $cdrec .= pack('V', $crc); // crc32
        $cdrec .= pack('V', $c_len); // compressed filesize
        $cdrec .= pack('V', $unc_len); // uncompressed filesize
        $cdrec .= pack('v', strlen($name) ); // length of filename
        $cdrec .= pack('v', 0 ); // extra field length
        $cdrec .= pack('v', 0 ); // file comment length
        $cdrec .= pack('v', 0 ); // disk number start
        $cdrec .= pack('v', 0 ); // internal file attributes
        $cdrec .= pack('V', 32 ); // external file attributes - 'archive' bit set
        $cdrec .= pack('V', $this -> old_offset ); // relative offset of local header
        $this->old_offset = $new_offset;
        $cdrec .= $name;
        $this->ctrl_dir[] = $cdrec;
    }
    private function file() {
        $data = implode('', $this -> datasec);
        $ctrldir = implode('', $this -> ctrl_dir);
        return    $data
                    .$ctrldir
                    .$this -> eof_ctrl_dir
                    .pack('v', sizeof($this -> ctrl_dir))
                    .pack('v', sizeof($this -> ctrl_dir))
                    .pack('V', strlen($ctrldir))
                    .pack('V', strlen($data))
                    ."\x00\x00";
    }
    //下面是zip解压部分
    protected   function readFileHeader($zip){
        $binary_data = fread($zip, 30);
        $header=array();
        $data = unpack('vchk/vid/vversion/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len', $binary_data);
        $header['filename'] = fread($zip, $data['filename_len']);
        if ($data['extra_len'] != 0) {
            $header['extra'] = fread($zip, $data['extra_len']);
        } else {
            $header['extra'] = '';
        }
        $header['compression'] = $data['compression'];$header['size'] = $data['size'];
        $header['compressed_size'] = $data['compressed_size'];
        $header['crc'] = $data['crc']; $header['flag'] = $data['flag'];
        $header['mdate'] = $data['mdate'];$header['mtime'] = $data['mtime'];
        if ($header['mdate'] && $header['mtime']){
            $hour=($header['mtime']&0xF800)>>11;$minute=($header['mtime']&0x07E0)>>5;
            $seconde=($header['mtime']&0x001F)*2;$year=(($header['mdate']&0xFE00)>>9)+1980;
            $month=($header['mdate']&0x01E0)>>5;$day=$header['mdate']&0x001F;
            $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
        }else{
            $header['mtime'] = TIME;
        }
        $header['stored_filename'] = $header['filename'];
        $header['status'] = 'ok';
        return $header;
    }
    protected  function readCentralFileHeaders($zip){
        $binary_data = fread($zip, 46);
        $header = unpack('vchkid/vid/vversion/vversion_extracted/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/Voffset', $binary_data);
        if ($header['filename_len'] != 0){
            $header['filename'] = fread($zip,$header['filename_len']);
        }else {
            $header['filename'] = '';
        }
        if ($header['extra_len'] != 0){
            $header['extra'] = fread($zip, $header['extra_len']);
        }else{
            $header['extra'] = '';
        }
        if ($header['comment_len'] != 0){
            $header['comment'] = fread($zip, $header['comment_len']);
        }else{
            $header['comment'] = '';
        }
        if ($header['mdate'] && $header['mtime']){
            $hour = ($header['mtime'] & 0xF800) >> 11;
            $minute = ($header['mtime'] & 0x07E0) >> 5;
            $seconde = ($header['mtime'] & 0x001F)*2;
            $year = (($header['mdate'] & 0xFE00) >> 9) + 1980;
            $month = ($header['mdate'] & 0x01E0) >> 5;
            $day = $header['mdate'] & 0x001F;
            $header['mtime'] = mktime($hour, $minute, $seconde, $month, $day, $year);
        }else {
            $header['mtime'] = TIME;
        }
        $header['stored_filename'] = $header['filename'];
        $header['status'] = 'ok';
        if (substr($header['filename'], -1) == '/')
            $header['external'] = 0x41FF0010;
        return $header;
    }
    protected function readCentralDir($zip,$zip_name){
        $centd=array();
        $size = filesize($zip_name);
        if ($size < 277) $maximum_size = $size;
            else $maximum_size=277;
        @fseek($zip, $size-$maximum_size);
        $pos = ftell($zip); $bytes = 0x00000000;
        while ($pos < $size){
            $byte = @fread($zip, 1); $bytes=($bytes << 8) | ord($byte);
            if ($bytes == 0x504b0506 or $bytes == 0x2e706870504b0506){
                $pos++;break;
            }
            $pos++;
        }
        $fdata=fread($zip,18);
        $data=@unpack('vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size',$fdata);
        if ($data['comment_size'] != 0) $centd['comment'] = fread($zip, $data['comment_size']);
            else $centd['comment'] = '';
        $centd['entries'] = $data['entries'];
        $centd['disk_entries'] = $data['disk_entries'];
        $centd['offset'] = $data['offset'];
        $centd['disk_start'] = $data['disk_start'];
        $centd['size'] = $data['size'];
        $centd['disk'] = $data['disk'];
        return $centd;
    }
    protected function extractFile($header,$to,$zip){
        $header = $this->readFileHeader($zip);
        if(substr($to,-1)!='/') $to.='/';
        if($to=='./') $to = '';
        $pth = explode('/',$to.$header['filename']);
        $mydir = '';
        for($i=0;$i<count($pth)-1;$i++){
            if(!$pth[$i]) continue;
            $mydir .= $pth[$i].'/';
            if((!is_dir($mydir) && @mkdir($mydir,0777))
                    || (($mydir==$to.$header['filename']
                    || ($mydir==$to && $this->total_folders==0)) && is_dir($mydir)) ){
                @chmod($mydir,0777);
                $this->total_folders ++;
            }
        }
        if(strrchr($header['filename'],'/')=='/') return true;
        if (!($header['external']==0x41FF0010)&&!($header['external']==16)){
            if ($header['compression']==0){
                $fp = @fopen($to.$header['filename'], 'wb');
                if(!$fp) return(-1);
                $size = $header['compressed_size'];
                while ($size != 0){
                    $read_size = ($size < 2048 ? $size : 2048);
                    $buffer = fread($zip, $read_size);
                    $binary_data = pack('a'.$read_size, $buffer);
                    @fwrite($fp, $binary_data, $read_size);
                    $size -= $read_size;
                }
                fclose($fp);
                touch($to.$header['filename'], $header['mtime']);
            }else{
                $fp = @fopen($to.$header['filename'].'.gz','wb');
                if(!$fp) return(-1);
                $binary_data = pack('va1a1Va1a1', 0x8b1f, Chr($header['compression']),
                Chr(0x00), TIME, Chr(0x00), Chr(3));
                fwrite($fp, $binary_data, 10);
                $size = $header['compressed_size'];
                while ($size != 0){
                    $read_size = ($size < 1024 ? $size : 1024);
                    $buffer = fread($zip, $read_size);
                    $binary_data = pack('a'.$read_size, $buffer);
                    @fwrite($fp, $binary_data, $read_size);
                    $size -= $read_size;
                }
                $binary_data = pack('VV', $header['crc'], $header['size']);
                fwrite($fp, $binary_data,8); fclose($fp);
                $gzp = @gzopen($to.$header['filename'].'.gz','rb') or die("Cette archive est compress!");
                if(!$gzp) return(-2);
                $fp = @fopen($to.$header['filename'],'wb');
                if(!$fp) return(-1);
                $size = $header['size'];
                while ($size != 0){
                    $read_size = ($size < 2048 ? $size : 2048);
                    $buffer = gzread($gzp, $read_size);
                    $binary_data = pack('a'.$read_size, $buffer);
                    @fwrite($fp, $binary_data, $read_size);
                    $size -= $read_size;
                }
                fclose($fp); gzclose($gzp);
                touch($to.$header['filename'], $header['mtime']);
                @unlink($to.$header['filename'].'.gz');
            }
        }
        $this->total_files ++;
        return true;
    }
}
